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Material-D is a Material, part of the system Unbreakable Dark materialized as a clone of Hayate Yagami during the Dark Fragment Incident. She is thus known among fans as Dark Hayate(闇のはやてYami no Hayate).

Her name is first introduced in The Battle of Aces in English Material-D and in Japanese "Lord Ruler of Darkness" (闇統べる王Yami Suberu Ō) without specific ruby-kanas. The "D" in her name is believed to stand for "Darkness", which is associated with Hayate and the Book of Darkness.

Dearche Kings Claudia[4](ディアーチェ・K(キングス)・クローディアDiāche Kinguzu Kurōdia), along Stern, Levi and Yuri, is student studying abroad in Uminari City. Her main outfit consists of a regular gakuran, a dark purple jacket over a cream school sweatshirt and a white shirt with a pale purple tie. She wears a purple greyish miniskirt, and she wears middle-length white socks and the required brown shoes.